drivers/phy/phy-core.c - kernel/msm-4.9 - Gitiles

 /*
  * phy-core.c  --  Generic Phy framework.
  *
  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
  *
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  */

 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/err.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/phy/phy.h>
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>

 static struct class *phy_class;
 static DEFINE_MUTEX(phy_provider_mutex);
 static LIST_HEAD(phy_provider_list);
 static DEFINE_IDA(phy_ida);

 static void devm_phy_release(struct device *dev, void *res)
 {
 	struct phy *phy = *(struct phy **)res;

 	phy_put(phy);
 }

 static void devm_phy_provider_release(struct device *dev, void *res)
 {
 	struct phy_provider *phy_provider = *(struct phy_provider **)res;

 	of_phy_provider_unregister(phy_provider);
 }

 static void devm_phy_consume(struct device *dev, void *res)
 {
 	struct phy *phy = *(struct phy **)res;

 	phy_destroy(phy);
 }

 static int devm_phy_match(struct device *dev, void *res, void *match_data)
 {
 	return res == match_data;
 }

 static struct phy *phy_lookup(struct device *device, const char *port)
 {
 	unsigned int count;
 	struct phy *phy;
 	struct device *dev;
 	struct phy_consumer *consumers;
 	struct class_dev_iter iter;

 	class_dev_iter_init(&iter, phy_class, NULL, NULL);
 	while ((dev = class_dev_iter_next(&iter))) {
 		phy = to_phy(dev);
 		count = phy->init_data->num_consumers;
 		consumers = phy->init_data->consumers;
 		while (count--) {
 			if (!strcmp(consumers->dev_name, dev_name(device)) &&
 					!strcmp(consumers->port, port)) {
 				class_dev_iter_exit(&iter);
 				return phy;
 			}
 			consumers++;
 		}
 	}

 	class_dev_iter_exit(&iter);
 	return ERR_PTR(-ENODEV);
 }

 static struct phy_provider *of_phy_provider_lookup(struct device_node *node)
 {
 	struct phy_provider *phy_provider;

 	list_for_each_entry(phy_provider, &phy_provider_list, list) {
 		if (phy_provider->dev->of_node == node)
 			return phy_provider;
 	}

 	return ERR_PTR(-EPROBE_DEFER);
 }

 int phy_pm_runtime_get(struct phy *phy)
 {
 	int ret;

 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;

 	ret = pm_runtime_get(&phy->dev);
 	if (ret < 0 && ret != -EINPROGRESS)
 		pm_runtime_put_noidle(&phy->dev);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_get);

 int phy_pm_runtime_get_sync(struct phy *phy)
 {
 	int ret;

 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;

 	ret = pm_runtime_get_sync(&phy->dev);
 	if (ret < 0)
 		pm_runtime_put_sync(&phy->dev);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);

 int phy_pm_runtime_put(struct phy *phy)
 {
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;

 	return pm_runtime_put(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_put);

 int phy_pm_runtime_put_sync(struct phy *phy)
 {
 	if (!pm_runtime_enabled(&phy->dev))
 		return -ENOTSUPP;

 	return pm_runtime_put_sync(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);

 void phy_pm_runtime_allow(struct phy *phy)
 {
 	if (!pm_runtime_enabled(&phy->dev))
 		return;

 	pm_runtime_allow(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);

 void phy_pm_runtime_forbid(struct phy *phy)
 {
 	if (!pm_runtime_enabled(&phy->dev))
 		return;

 	pm_runtime_forbid(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);

 int phy_init(struct phy *phy)
 {
 	int ret;

 	if (!phy)
 		return 0;

 	ret = phy_pm_runtime_get_sync(phy);
 	if (ret < 0 && ret != -ENOTSUPP)
 		return ret;

 	mutex_lock(&phy->mutex);
 	if (phy->init_count == 0 && phy->ops->init) {
 		ret = phy->ops->init(phy);
 		if (ret < 0) {
 			dev_err(&phy->dev, "phy init failed --> %d\n", ret);
 			goto out;
 		}
 	}
 	++phy->init_count;

 out:
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put(phy);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_init);

 int phy_exit(struct phy *phy)
 {
 	int ret;

 	if (!phy)
 		return 0;

 	ret = phy_pm_runtime_get_sync(phy);
 	if (ret < 0 && ret != -ENOTSUPP)
 		return ret;

 	mutex_lock(&phy->mutex);
 	if (phy->init_count == 1 && phy->ops->exit) {
 		ret = phy->ops->exit(phy);
 		if (ret < 0) {
 			dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
 			goto out;
 		}
 	}
 	--phy->init_count;

 out:
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put(phy);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_exit);

 int phy_power_on(struct phy *phy)
 {
 	int ret;

 	if (!phy)
 		return 0;

 	ret = phy_pm_runtime_get_sync(phy);
 	if (ret < 0 && ret != -ENOTSUPP)
 		return ret;

 	mutex_lock(&phy->mutex);
 	if (phy->power_count == 0 && phy->ops->power_on) {
 		ret = phy->ops->power_on(phy);
 		if (ret < 0) {
 			dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
 			goto out;
 		}
 	}
 	++phy->power_count;
 	mutex_unlock(&phy->mutex);
 	return 0;

 out:
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put_sync(phy);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_power_on);

 int phy_power_off(struct phy *phy)
 {
 	int ret;

 	if (!phy)
 		return 0;

 	mutex_lock(&phy->mutex);
 	if (phy->power_count == 1 && phy->ops->power_off) {
 		ret =  phy->ops->power_off(phy);
 		if (ret < 0) {
 			dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
 			mutex_unlock(&phy->mutex);
 			return ret;
 		}
 	}
 	--phy->power_count;
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put(phy);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(phy_power_off);

 /**
  * of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @dev: device that requests this phy
  * @index: the index of the phy
  *
  * Returns the phy associated with the given phandle value,
  * after getting a refcount to it or -ENODEV if there is no such phy or
  * -EPROBE_DEFER if there is a phandle to the phy, but the device is
  * not yet loaded. This function uses of_xlate call back function provided
  * while registering the phy_provider to find the phy instance.
  */
 static struct phy *of_phy_get(struct device *dev, int index)
 {
 	int ret;
 	struct phy_provider *phy_provider;
 	struct phy *phy = NULL;
 	struct of_phandle_args args;

 	ret = of_parse_phandle_with_args(dev->of_node, "phys", "#phy-cells",
 		index, &args);
 	if (ret) {
 		dev_dbg(dev, "failed to get phy in %s node\n",
 			dev->of_node->full_name);
 		return ERR_PTR(-ENODEV);
 	}

 	mutex_lock(&phy_provider_mutex);
 	phy_provider = of_phy_provider_lookup(args.np);
 	if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) {
 		phy = ERR_PTR(-EPROBE_DEFER);
 		goto err0;
 	}

 	phy = phy_provider->of_xlate(phy_provider->dev, &args);
 	module_put(phy_provider->owner);

 err0:
 	mutex_unlock(&phy_provider_mutex);
 	of_node_put(args.np);

 	return phy;
 }

 /**
  * phy_put() - release the PHY
  * @phy: the phy returned by phy_get()
  *
  * Releases a refcount the caller received from phy_get().
  */
 void phy_put(struct phy *phy)
 {
 	if (!phy || IS_ERR(phy))
 		return;

 	module_put(phy->ops->owner);
 	put_device(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_put);

 /**
  * devm_phy_put() - release the PHY
  * @dev: device that wants to release this phy
  * @phy: the phy returned by devm_phy_get()
  *
  * destroys the devres associated with this phy and invokes phy_put
  * to release the phy.
  */
 void devm_phy_put(struct device *dev, struct phy *phy)
 {
 	int r;

 	if (!phy)
 		return;

 	r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
 	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_phy_put);

 /**
  * of_phy_simple_xlate() - returns the phy instance from phy provider
  * @dev: the PHY provider device
  * @args: of_phandle_args (not used here)
  *
  * Intended to be used by phy provider for the common case where #phy-cells is
  * 0. For other cases where #phy-cells is greater than '0', the phy provider
  * should provide a custom of_xlate function that reads the *args* and returns
  * the appropriate phy.
  */
 struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args
 	*args)
 {
 	struct phy *phy;
 	struct class_dev_iter iter;
 	struct device_node *node = dev->of_node;

 	class_dev_iter_init(&iter, phy_class, NULL, NULL);
 	while ((dev = class_dev_iter_next(&iter))) {
 		phy = to_phy(dev);
 		if (node != phy->dev.of_node)
 			continue;

 		class_dev_iter_exit(&iter);
 		return phy;
 	}

 	class_dev_iter_exit(&iter);
 	return ERR_PTR(-ENODEV);
 }
 EXPORT_SYMBOL_GPL(of_phy_simple_xlate);

 /**
  * phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or the name of the controller
  * port for non-dt case
  *
  * Returns the phy driver, after getting a refcount to it; or
  * -ENODEV if there is no such phy.  The caller is responsible for
  * calling phy_put() to release that count.
  */
 struct phy *phy_get(struct device *dev, const char *string)
 {
 	int index = 0;
 	struct phy *phy;

 	if (string == NULL) {
 		dev_WARN(dev, "missing string\n");
 		return ERR_PTR(-EINVAL);
 	}

 	if (dev->of_node) {
 		index = of_property_match_string(dev->of_node, "phy-names",
 			string);
 		phy = of_phy_get(dev, index);
 		if (IS_ERR(phy)) {
 			dev_err(dev, "unable to find phy\n");
 			return phy;
 		}
 	} else {
 		phy = phy_lookup(dev, string);
 		if (IS_ERR(phy)) {
 			dev_err(dev, "unable to find phy\n");
 			return phy;
 		}
 	}

 	if (!try_module_get(phy->ops->owner))
 		return ERR_PTR(-EPROBE_DEFER);

 	get_device(&phy->dev);

 	return phy;
 }
 EXPORT_SYMBOL_GPL(phy_get);

 /**
  * phy_optional_get() - lookup and obtain a reference to an optional phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or the name of the controller
  * port for non-dt case
  *
  * Returns the phy driver, after getting a refcount to it; or
  * NULL if there is no such phy.  The caller is responsible for
  * calling phy_put() to release that count.
  */
 struct phy *phy_optional_get(struct device *dev, const char *string)
 {
 	struct phy *phy = phy_get(dev, string);

 	if (PTR_ERR(phy) == -ENODEV)
 		phy = NULL;

 	return phy;
 }
 EXPORT_SYMBOL_GPL(phy_optional_get);

 /**
  * devm_phy_get() - lookup and obtain a reference to a phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or phy device name
  * for non-dt case
  *
  * Gets the phy using phy_get(), and associates a device with it using
  * devres. On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct phy *devm_phy_get(struct device *dev, const char *string)
 {
 	struct phy **ptr, *phy;

 	ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);

 	phy = phy_get(dev, string);
 	if (!IS_ERR(phy)) {
 		*ptr = phy;
 		devres_add(dev, ptr);
 	} else {
 		devres_free(ptr);
 	}

 	return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_get);

 /**
  * devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
  * @dev: device that requests this phy
  * @string: the phy name as given in the dt data or phy device name
  * for non-dt case
  *
  * Gets the phy using phy_get(), and associates a device with it using
  * devres. On driver detach, release function is invoked on the devres
  * data, then, devres data is freed. This differs to devm_phy_get() in
  * that if the phy does not exist, it is not considered an error and
  * -ENODEV will not be returned. Instead the NULL phy is returned,
  * which can be passed to all other phy consumer calls.
  */
 struct phy *devm_phy_optional_get(struct device *dev, const char *string)
 {
 	struct phy *phy = devm_phy_get(dev, string);

 	if (PTR_ERR(phy) == -ENODEV)
 		phy = NULL;

 	return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_optional_get);

 /**
  * phy_create() - create a new phy
  * @dev: device that is creating the new phy
  * @ops: function pointers for performing phy operations
  * @init_data: contains the list of PHY consumers or NULL
  *
  * Called to create a phy using phy framework.
  */
 struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
 	struct phy_init_data *init_data)
 {
 	int ret;
 	int id;
 	struct phy *phy;

 	if (WARN_ON(!dev))
 		return ERR_PTR(-EINVAL);

 	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
 	if (!phy)
 		return ERR_PTR(-ENOMEM);

 	id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
 	if (id < 0) {
 		dev_err(dev, "unable to get id\n");
 		ret = id;
 		goto free_phy;
 	}

 	device_initialize(&phy->dev);
 	mutex_init(&phy->mutex);

 	phy->dev.class = phy_class;
 	phy->dev.parent = dev;
 	phy->dev.of_node = dev->of_node;
 	phy->id = id;
 	phy->ops = ops;
 	phy->init_data = init_data;

 	ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
 	if (ret)
 		goto put_dev;

 	ret = device_add(&phy->dev);
 	if (ret)
 		goto put_dev;

 	if (pm_runtime_enabled(dev)) {
 		pm_runtime_enable(&phy->dev);
 		pm_runtime_no_callbacks(&phy->dev);
 	}

 	return phy;

 put_dev:
 	put_device(&phy->dev);
 	ida_remove(&phy_ida, phy->id);
 free_phy:
 	kfree(phy);
 	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(phy_create);

 /**
  * devm_phy_create() - create a new phy
  * @dev: device that is creating the new phy
  * @ops: function pointers for performing phy operations
  * @init_data: contains the list of PHY consumers or NULL
  *
  * Creates a new PHY device adding it to the PHY class.
  * While at that, it also associates the device with the phy using devres.
  * On driver detach, release function is invoked on the devres data,
  * then, devres data is freed.
  */
 struct phy *devm_phy_create(struct device *dev, const struct phy_ops *ops,
 	struct phy_init_data *init_data)
 {
 	struct phy **ptr, *phy;

 	ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);

 	phy = phy_create(dev, ops, init_data);
 	if (!IS_ERR(phy)) {
 		*ptr = phy;
 		devres_add(dev, ptr);
 	} else {
 		devres_free(ptr);
 	}

 	return phy;
 }
 EXPORT_SYMBOL_GPL(devm_phy_create);

 /**
  * phy_destroy() - destroy the phy
  * @phy: the phy to be destroyed
  *
  * Called to destroy the phy.
  */
 void phy_destroy(struct phy *phy)
 {
 	pm_runtime_disable(&phy->dev);
 	device_unregister(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_destroy);

 /**
  * devm_phy_destroy() - destroy the PHY
  * @dev: device that wants to release this phy
  * @phy: the phy returned by devm_phy_get()
  *
  * destroys the devres associated with this phy and invokes phy_destroy
  * to destroy the phy.
  */
 void devm_phy_destroy(struct device *dev, struct phy *phy)
 {
 	int r;

 	r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
 	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_phy_destroy);

 /**
  * __of_phy_provider_register() - create/register phy provider with the framework
  * @dev: struct device of the phy provider
  * @owner: the module owner containing of_xlate
  * @of_xlate: function pointer to obtain phy instance from phy provider
  *
  * Creates struct phy_provider from dev and of_xlate function pointer.
  * This is used in the case of dt boot for finding the phy instance from
  * phy provider.
  */
 struct phy_provider *__of_phy_provider_register(struct device *dev,
 	struct module *owner, struct phy * (*of_xlate)(struct device *dev,
 	struct of_phandle_args *args))
 {
 	struct phy_provider *phy_provider;

 	phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
 	if (!phy_provider)
 		return ERR_PTR(-ENOMEM);

 	phy_provider->dev = dev;
 	phy_provider->owner = owner;
 	phy_provider->of_xlate = of_xlate;

 	mutex_lock(&phy_provider_mutex);
 	list_add_tail(&phy_provider->list, &phy_provider_list);
 	mutex_unlock(&phy_provider_mutex);

 	return phy_provider;
 }
 EXPORT_SYMBOL_GPL(__of_phy_provider_register);

 /**
  * __devm_of_phy_provider_register() - create/register phy provider with the
  * framework
  * @dev: struct device of the phy provider
  * @owner: the module owner containing of_xlate
  * @of_xlate: function pointer to obtain phy instance from phy provider
  *
  * Creates struct phy_provider from dev and of_xlate function pointer.
  * This is used in the case of dt boot for finding the phy instance from
  * phy provider. While at that, it also associates the device with the
  * phy provider using devres. On driver detach, release function is invoked
  * on the devres data, then, devres data is freed.
  */
 struct phy_provider *__devm_of_phy_provider_register(struct device *dev,
 	struct module *owner, struct phy * (*of_xlate)(struct device *dev,
 	struct of_phandle_args *args))
 {
 	struct phy_provider **ptr, *phy_provider;

 	ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);

 	phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
 	if (!IS_ERR(phy_provider)) {
 		*ptr = phy_provider;
 		devres_add(dev, ptr);
 	} else {
 		devres_free(ptr);
 	}

 	return phy_provider;
 }
 EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);

 /**
  * of_phy_provider_unregister() - unregister phy provider from the framework
  * @phy_provider: phy provider returned by of_phy_provider_register()
  *
  * Removes the phy_provider created using of_phy_provider_register().
  */
 void of_phy_provider_unregister(struct phy_provider *phy_provider)
 {
 	if (IS_ERR(phy_provider))
 		return;

 	mutex_lock(&phy_provider_mutex);
 	list_del(&phy_provider->list);
 	kfree(phy_provider);
 	mutex_unlock(&phy_provider_mutex);
 }
 EXPORT_SYMBOL_GPL(of_phy_provider_unregister);

 /**
  * devm_of_phy_provider_unregister() - remove phy provider from the framework
  * @dev: struct device of the phy provider
  *
  * destroys the devres associated with this phy provider and invokes
  * of_phy_provider_unregister to unregister the phy provider.
  */
 void devm_of_phy_provider_unregister(struct device *dev,
 	struct phy_provider *phy_provider) {
 	int r;

 	r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
 		phy_provider);
 	dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);

 /**
  * phy_release() - release the phy
  * @dev: the dev member within phy
  *
  * When the last reference to the device is removed, it is called
  * from the embedded kobject as release method.
  */
 static void phy_release(struct device *dev)
 {
 	struct phy *phy;

 	phy = to_phy(dev);
 	dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
 	ida_remove(&phy_ida, phy->id);
 	kfree(phy);
 }

 static int __init phy_core_init(void)
 {
 	phy_class = class_create(THIS_MODULE, "phy");
 	if (IS_ERR(phy_class)) {
 		pr_err("failed to create phy class --> %ld\n",
 			PTR_ERR(phy_class));
 		return PTR_ERR(phy_class);
 	}

 	phy_class->dev_release = phy_release;

 	return 0;
 }
 module_init(phy_core_init);

 static void __exit phy_core_exit(void)
 {
 	class_destroy(phy_class);
 }
 module_exit(phy_core_exit);

 MODULE_DESCRIPTION("Generic PHY Framework");
 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
 MODULE_LICENSE("GPL v2");
	/*
	* phy-core.c -- Generic Phy framework.
	*
	* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
	*
	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*/

	#include <linux/kernel.h>
	#include <linux/export.h>
	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/phy/phy.h>
	#include <linux/idr.h>
	#include <linux/pm_runtime.h>

	static struct class *phy_class;
	static DEFINE_MUTEX(phy_provider_mutex);
	static LIST_HEAD(phy_provider_list);
	static DEFINE_IDA(phy_ida);

	static void devm_phy_release(struct device dev, void res)
	{
	struct phy phy = (struct phy **)res;

	phy_put(phy);
	}

	static void devm_phy_provider_release(struct device dev, void res)
	{
	struct phy_provider phy_provider = (struct phy_provider **)res;

	of_phy_provider_unregister(phy_provider);
	}

	static void devm_phy_consume(struct device dev, void res)
	{
	struct phy phy = (struct phy **)res;

	phy_destroy(phy);
	}

	static int devm_phy_match(struct device dev, void res, void *match_data)
	{
	return res == match_data;
	}

	static struct phy phy_lookup(struct device device, const char *port)
	{
	unsigned int count;
	struct phy *phy;
	struct device *dev;
	struct phy_consumer *consumers;
	struct class_dev_iter iter;

	class_dev_iter_init(&iter, phy_class, NULL, NULL);
	while ((dev = class_dev_iter_next(&iter))) {
	phy = to_phy(dev);
	count = phy->init_data->num_consumers;
	consumers = phy->init_data->consumers;
	while (count--) {
	if (!strcmp(consumers->dev_name, dev_name(device)) &&
	!strcmp(consumers->port, port)) {
	class_dev_iter_exit(&iter);
	return phy;
	}
	consumers++;
	}
	}

	class_dev_iter_exit(&iter);
	return ERR_PTR(-ENODEV);
	}

	static struct phy_provider of_phy_provider_lookup(struct device_node node)
	{
	struct phy_provider *phy_provider;

	list_for_each_entry(phy_provider, &phy_provider_list, list) {
	if (phy_provider->dev->of_node == node)
	return phy_provider;
	}

	return ERR_PTR(-EPROBE_DEFER);
	}

	int phy_pm_runtime_get(struct phy *phy)
	{
	int ret;

	if (!pm_runtime_enabled(&phy->dev))
	return -ENOTSUPP;

	ret = pm_runtime_get(&phy->dev);
	if (ret < 0 && ret != -EINPROGRESS)
	pm_runtime_put_noidle(&phy->dev);

	return ret;
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_get);

	int phy_pm_runtime_get_sync(struct phy *phy)
	{
	int ret;

	if (!pm_runtime_enabled(&phy->dev))
	return -ENOTSUPP;

	ret = pm_runtime_get_sync(&phy->dev);
	if (ret < 0)
	pm_runtime_put_sync(&phy->dev);

	return ret;
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync);

	int phy_pm_runtime_put(struct phy *phy)
	{
	if (!pm_runtime_enabled(&phy->dev))
	return -ENOTSUPP;

	return pm_runtime_put(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_put);

	int phy_pm_runtime_put_sync(struct phy *phy)
	{
	if (!pm_runtime_enabled(&phy->dev))
	return -ENOTSUPP;

	return pm_runtime_put_sync(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync);

	void phy_pm_runtime_allow(struct phy *phy)
	{
	if (!pm_runtime_enabled(&phy->dev))
	return;

	pm_runtime_allow(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_allow);

	void phy_pm_runtime_forbid(struct phy *phy)
	{
	if (!pm_runtime_enabled(&phy->dev))
	return;

	pm_runtime_forbid(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid);

	int phy_init(struct phy *phy)
	{
	int ret;

	if (!phy)
	return 0;

	ret = phy_pm_runtime_get_sync(phy);
	if (ret < 0 && ret != -ENOTSUPP)
	return ret;

	mutex_lock(&phy->mutex);
	if (phy->init_count == 0 && phy->ops->init) {
	ret = phy->ops->init(phy);
	if (ret < 0) {
	dev_err(&phy->dev, "phy init failed --> %d\n", ret);
	goto out;
	}
	}
	++phy->init_count;

	out:
	mutex_unlock(&phy->mutex);
	phy_pm_runtime_put(phy);
	return ret;
	}
	EXPORT_SYMBOL_GPL(phy_init);

	int phy_exit(struct phy *phy)
	{
	int ret;

	if (!phy)
	return 0;

	ret = phy_pm_runtime_get_sync(phy);
	if (ret < 0 && ret != -ENOTSUPP)
	return ret;

	mutex_lock(&phy->mutex);
	if (phy->init_count == 1 && phy->ops->exit) {
	ret = phy->ops->exit(phy);
	if (ret < 0) {
	dev_err(&phy->dev, "phy exit failed --> %d\n", ret);
	goto out;
	}
	}
	--phy->init_count;

	out:
	mutex_unlock(&phy->mutex);
	phy_pm_runtime_put(phy);
	return ret;
	}
	EXPORT_SYMBOL_GPL(phy_exit);

	int phy_power_on(struct phy *phy)
	{
	int ret;

	if (!phy)
	return 0;

	ret = phy_pm_runtime_get_sync(phy);
	if (ret < 0 && ret != -ENOTSUPP)
	return ret;

	mutex_lock(&phy->mutex);
	if (phy->power_count == 0 && phy->ops->power_on) {
	ret = phy->ops->power_on(phy);
	if (ret < 0) {
	dev_err(&phy->dev, "phy poweron failed --> %d\n", ret);
	goto out;
	}
	}
	++phy->power_count;
	mutex_unlock(&phy->mutex);
	return 0;

	out:
	mutex_unlock(&phy->mutex);
	phy_pm_runtime_put_sync(phy);

	return ret;
	}
	EXPORT_SYMBOL_GPL(phy_power_on);

	int phy_power_off(struct phy *phy)
	{
	int ret;

	if (!phy)
	return 0;

	mutex_lock(&phy->mutex);
	if (phy->power_count == 1 && phy->ops->power_off) {
	ret = phy->ops->power_off(phy);
	if (ret < 0) {
	dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret);
	mutex_unlock(&phy->mutex);
	return ret;
	}
	}
	--phy->power_count;
	mutex_unlock(&phy->mutex);
	phy_pm_runtime_put(phy);

	return 0;
	}
	EXPORT_SYMBOL_GPL(phy_power_off);

	/**
	* of_phy_get() - lookup and obtain a reference to a phy by phandle
	* @dev: device that requests this phy
	* @index: the index of the phy
	*
	* Returns the phy associated with the given phandle value,
	* after getting a refcount to it or -ENODEV if there is no such phy or
	* -EPROBE_DEFER if there is a phandle to the phy, but the device is
	* not yet loaded. This function uses of_xlate call back function provided
	* while registering the phy_provider to find the phy instance.
	*/
	static struct phy of_phy_get(struct device dev, int index)
	{
	int ret;
	struct phy_provider *phy_provider;
	struct phy *phy = NULL;
	struct of_phandle_args args;

	ret = of_parse_phandle_with_args(dev->of_node, "phys", "#phy-cells",
	index, &args);
	if (ret) {
	dev_dbg(dev, "failed to get phy in %s node\n",
	dev->of_node->full_name);
	return ERR_PTR(-ENODEV);
	}

	mutex_lock(&phy_provider_mutex);
	phy_provider = of_phy_provider_lookup(args.np);
	if (IS_ERR(phy_provider) \|\| !try_module_get(phy_provider->owner)) {
	phy = ERR_PTR(-EPROBE_DEFER);
	goto err0;
	}

	phy = phy_provider->of_xlate(phy_provider->dev, &args);
	module_put(phy_provider->owner);

	err0:
	mutex_unlock(&phy_provider_mutex);
	of_node_put(args.np);

	return phy;
	}

	/**
	* phy_put() - release the PHY
	* @phy: the phy returned by phy_get()
	*
	* Releases a refcount the caller received from phy_get().
	*/
	void phy_put(struct phy *phy)
	{
	if (!phy \|\| IS_ERR(phy))
	return;

	module_put(phy->ops->owner);
	put_device(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_put);

	/**
	* devm_phy_put() - release the PHY
	* @dev: device that wants to release this phy
	* @phy: the phy returned by devm_phy_get()
	*
	* destroys the devres associated with this phy and invokes phy_put
	* to release the phy.
	*/
	void devm_phy_put(struct device dev, struct phy phy)
	{
	int r;

	if (!phy)
	return;

	r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
	}
	EXPORT_SYMBOL_GPL(devm_phy_put);

	/**
	* of_phy_simple_xlate() - returns the phy instance from phy provider
	* @dev: the PHY provider device
	* @args: of_phandle_args (not used here)
	*
	* Intended to be used by phy provider for the common case where #phy-cells is
	* 0. For other cases where #phy-cells is greater than '0', the phy provider
	* should provide a custom of_xlate function that reads the args and returns
	* the appropriate phy.
	*/
	struct phy of_phy_simple_xlate(struct device dev, struct of_phandle_args
	*args)
	{
	struct phy *phy;
	struct class_dev_iter iter;
	struct device_node *node = dev->of_node;

	class_dev_iter_init(&iter, phy_class, NULL, NULL);
	while ((dev = class_dev_iter_next(&iter))) {
	phy = to_phy(dev);
	if (node != phy->dev.of_node)
	continue;

	class_dev_iter_exit(&iter);
	return phy;
	}

	class_dev_iter_exit(&iter);
	return ERR_PTR(-ENODEV);
	}
	EXPORT_SYMBOL_GPL(of_phy_simple_xlate);

	/**
	* phy_get() - lookup and obtain a reference to a phy.
	* @dev: device that requests this phy
	* @string: the phy name as given in the dt data or the name of the controller
	* port for non-dt case
	*
	* Returns the phy driver, after getting a refcount to it; or
	* -ENODEV if there is no such phy. The caller is responsible for
	* calling phy_put() to release that count.
	*/
	struct phy phy_get(struct device dev, const char *string)
	{
	int index = 0;
	struct phy *phy;

	if (string == NULL) {
	dev_WARN(dev, "missing string\n");
	return ERR_PTR(-EINVAL);
	}

	if (dev->of_node) {
	index = of_property_match_string(dev->of_node, "phy-names",
	string);
	phy = of_phy_get(dev, index);
	if (IS_ERR(phy)) {
	dev_err(dev, "unable to find phy\n");
	return phy;
	}
	} else {
	phy = phy_lookup(dev, string);
	if (IS_ERR(phy)) {
	dev_err(dev, "unable to find phy\n");
	return phy;
	}
	}

	if (!try_module_get(phy->ops->owner))
	return ERR_PTR(-EPROBE_DEFER);

	get_device(&phy->dev);

	return phy;
	}
	EXPORT_SYMBOL_GPL(phy_get);

	/**
	* phy_optional_get() - lookup and obtain a reference to an optional phy.
	* @dev: device that requests this phy
	* @string: the phy name as given in the dt data or the name of the controller
	* port for non-dt case
	*
	* Returns the phy driver, after getting a refcount to it; or
	* NULL if there is no such phy. The caller is responsible for
	* calling phy_put() to release that count.
	*/
	struct phy phy_optional_get(struct device dev, const char *string)
	{
	struct phy *phy = phy_get(dev, string);

	if (PTR_ERR(phy) == -ENODEV)
	phy = NULL;

	return phy;
	}
	EXPORT_SYMBOL_GPL(phy_optional_get);

	/**
	* devm_phy_get() - lookup and obtain a reference to a phy.
	* @dev: device that requests this phy
	* @string: the phy name as given in the dt data or phy device name
	* for non-dt case
	*
	* Gets the phy using phy_get(), and associates a device with it using
	* devres. On driver detach, release function is invoked on the devres data,
	* then, devres data is freed.
	*/
	struct phy devm_phy_get(struct device dev, const char *string)
	{
	struct phy *ptr, phy;

	ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
	return ERR_PTR(-ENOMEM);

	phy = phy_get(dev, string);
	if (!IS_ERR(phy)) {
	*ptr = phy;
	devres_add(dev, ptr);
	} else {
	devres_free(ptr);
	}

	return phy;
	}
	EXPORT_SYMBOL_GPL(devm_phy_get);

	/**
	* devm_phy_optional_get() - lookup and obtain a reference to an optional phy.
	* @dev: device that requests this phy
	* @string: the phy name as given in the dt data or phy device name
	* for non-dt case
	*
	* Gets the phy using phy_get(), and associates a device with it using
	* devres. On driver detach, release function is invoked on the devres
	* data, then, devres data is freed. This differs to devm_phy_get() in
	* that if the phy does not exist, it is not considered an error and
	* -ENODEV will not be returned. Instead the NULL phy is returned,
	* which can be passed to all other phy consumer calls.
	*/
	struct phy devm_phy_optional_get(struct device dev, const char *string)
	{
	struct phy *phy = devm_phy_get(dev, string);

	if (PTR_ERR(phy) == -ENODEV)
	phy = NULL;

	return phy;
	}
	EXPORT_SYMBOL_GPL(devm_phy_optional_get);

	/**
	* phy_create() - create a new phy
	* @dev: device that is creating the new phy
	* @ops: function pointers for performing phy operations
	* @init_data: contains the list of PHY consumers or NULL
	*
	* Called to create a phy using phy framework.
	*/
	struct phy phy_create(struct device dev, const struct phy_ops *ops,
	struct phy_init_data *init_data)
	{
	int ret;
	int id;
	struct phy *phy;

	if (WARN_ON(!dev))
	return ERR_PTR(-EINVAL);

	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
	if (!phy)
	return ERR_PTR(-ENOMEM);

	id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL);
	if (id < 0) {
	dev_err(dev, "unable to get id\n");
	ret = id;
	goto free_phy;
	}

	device_initialize(&phy->dev);
	mutex_init(&phy->mutex);

	phy->dev.class = phy_class;
	phy->dev.parent = dev;
	phy->dev.of_node = dev->of_node;
	phy->id = id;
	phy->ops = ops;
	phy->init_data = init_data;

	ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id);
	if (ret)
	goto put_dev;

	ret = device_add(&phy->dev);
	if (ret)
	goto put_dev;

	if (pm_runtime_enabled(dev)) {
	pm_runtime_enable(&phy->dev);
	pm_runtime_no_callbacks(&phy->dev);
	}

	return phy;

	put_dev:
	put_device(&phy->dev);
	ida_remove(&phy_ida, phy->id);
	free_phy:
	kfree(phy);
	return ERR_PTR(ret);
	}
	EXPORT_SYMBOL_GPL(phy_create);

	/**
	* devm_phy_create() - create a new phy
	* @dev: device that is creating the new phy
	* @ops: function pointers for performing phy operations
	* @init_data: contains the list of PHY consumers or NULL
	*
	* Creates a new PHY device adding it to the PHY class.
	* While at that, it also associates the device with the phy using devres.
	* On driver detach, release function is invoked on the devres data,
	* then, devres data is freed.
	*/
	struct phy devm_phy_create(struct device dev, const struct phy_ops *ops,
	struct phy_init_data *init_data)
	{
	struct phy *ptr, phy;

	ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
	return ERR_PTR(-ENOMEM);

	phy = phy_create(dev, ops, init_data);
	if (!IS_ERR(phy)) {
	*ptr = phy;
	devres_add(dev, ptr);
	} else {
	devres_free(ptr);
	}

	return phy;
	}
	EXPORT_SYMBOL_GPL(devm_phy_create);

	/**
	* phy_destroy() - destroy the phy
	* @phy: the phy to be destroyed
	*
	* Called to destroy the phy.
	*/
	void phy_destroy(struct phy *phy)
	{
	pm_runtime_disable(&phy->dev);
	device_unregister(&phy->dev);
	}
	EXPORT_SYMBOL_GPL(phy_destroy);

	/**
	* devm_phy_destroy() - destroy the PHY
	* @dev: device that wants to release this phy
	* @phy: the phy returned by devm_phy_get()
	*
	* destroys the devres associated with this phy and invokes phy_destroy
	* to destroy the phy.
	*/
	void devm_phy_destroy(struct device dev, struct phy phy)
	{
	int r;

	r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy);
	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
	}
	EXPORT_SYMBOL_GPL(devm_phy_destroy);

	/**
	* __of_phy_provider_register() - create/register phy provider with the framework
	* @dev: struct device of the phy provider
	* @owner: the module owner containing of_xlate
	* @of_xlate: function pointer to obtain phy instance from phy provider
	*
	* Creates struct phy_provider from dev and of_xlate function pointer.
	* This is used in the case of dt boot for finding the phy instance from
	* phy provider.
	*/
	struct phy_provider __of_phy_provider_register(struct device dev,
	struct module owner, struct phy (of_xlate)(struct device dev,
	struct of_phandle_args *args))
	{
	struct phy_provider *phy_provider;

	phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL);
	if (!phy_provider)
	return ERR_PTR(-ENOMEM);

	phy_provider->dev = dev;
	phy_provider->owner = owner;
	phy_provider->of_xlate = of_xlate;

	mutex_lock(&phy_provider_mutex);
	list_add_tail(&phy_provider->list, &phy_provider_list);
	mutex_unlock(&phy_provider_mutex);

	return phy_provider;
	}
	EXPORT_SYMBOL_GPL(__of_phy_provider_register);

	/**
	* __devm_of_phy_provider_register() - create/register phy provider with the
	* framework
	* @dev: struct device of the phy provider
	* @owner: the module owner containing of_xlate
	* @of_xlate: function pointer to obtain phy instance from phy provider
	*
	* Creates struct phy_provider from dev and of_xlate function pointer.
	* This is used in the case of dt boot for finding the phy instance from
	* phy provider. While at that, it also associates the device with the
	* phy provider using devres. On driver detach, release function is invoked
	* on the devres data, then, devres data is freed.
	*/
	struct phy_provider __devm_of_phy_provider_register(struct device dev,
	struct module owner, struct phy (of_xlate)(struct device dev,
	struct of_phandle_args *args))
	{
	struct phy_provider *ptr, phy_provider;

	ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
	return ERR_PTR(-ENOMEM);

	phy_provider = __of_phy_provider_register(dev, owner, of_xlate);
	if (!IS_ERR(phy_provider)) {
	*ptr = phy_provider;
	devres_add(dev, ptr);
	} else {
	devres_free(ptr);
	}

	return phy_provider;
	}
	EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register);

	/**
	* of_phy_provider_unregister() - unregister phy provider from the framework
	* @phy_provider: phy provider returned by of_phy_provider_register()
	*
	* Removes the phy_provider created using of_phy_provider_register().
	*/
	void of_phy_provider_unregister(struct phy_provider *phy_provider)
	{
	if (IS_ERR(phy_provider))
	return;

	mutex_lock(&phy_provider_mutex);
	list_del(&phy_provider->list);
	kfree(phy_provider);
	mutex_unlock(&phy_provider_mutex);
	}
	EXPORT_SYMBOL_GPL(of_phy_provider_unregister);

	/**
	* devm_of_phy_provider_unregister() - remove phy provider from the framework
	* @dev: struct device of the phy provider
	*
	* destroys the devres associated with this phy provider and invokes
	* of_phy_provider_unregister to unregister the phy provider.
	*/
	void devm_of_phy_provider_unregister(struct device *dev,
	struct phy_provider *phy_provider) {
	int r;

	r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match,
	phy_provider);
	dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n");
	}
	EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister);

	/**
	* phy_release() - release the phy
	* @dev: the dev member within phy
	*
	* When the last reference to the device is removed, it is called
	* from the embedded kobject as release method.
	*/
	static void phy_release(struct device *dev)
	{
	struct phy *phy;

	phy = to_phy(dev);
	dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
	ida_remove(&phy_ida, phy->id);
	kfree(phy);
	}

	static int __init phy_core_init(void)
	{
	phy_class = class_create(THIS_MODULE, "phy");
	if (IS_ERR(phy_class)) {
	pr_err("failed to create phy class --> %ld\n",
	PTR_ERR(phy_class));
	return PTR_ERR(phy_class);
	}

	phy_class->dev_release = phy_release;

	return 0;
	}
	module_init(phy_core_init);

	static void __exit phy_core_exit(void)
	{
	class_destroy(phy_class);
	}
	module_exit(phy_core_exit);

	MODULE_DESCRIPTION("Generic PHY Framework");
	MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
	MODULE_LICENSE("GPL v2");